These issues (some minor and some major) were addressed by Ford through TSB’s or SSM’s.
Ford ids speed items software#
The early 2018 S550’s w/10R80’s did have some operational issues with software and hardware. Use only Motorcraft MERCON® ULV Automatic Transmission Fluid XT-12-QULV (WSS-M2C949-A) or equivalent when servicing a 10R80 automatic transmission. The engagement can be so harsh that it feels as if the car has been hit by another vehicle or like the driveline will rip the rear from the car.ħ) Erratic shifts - seems like the trans is hunting or prematurely auto shifts gears when it should not be doing so.Ĩ) Trans seems to remain in a higher gear when slowing down as vehicle MPH is decreasing when trans should actually be going into an obvious lower gear. It feels like the trans is unable to determine which gear to go into as the RPMs are increasing.Ĥ) Lack of initial engagement into from Park into Reverse if exterior temps are below 50*.ĥ) Lack of engagement from Park into Reverse when car is totally in normal temp range (190*-210*), regardless of exterior temps.Ħ) Extremely harsh engagement from Park into Reverse OR from Reverse to Drive (1st gear). The known S550 10R80 issues (does NOT affect all S550’s equipped with 10R80’s):ġ) Harsh, clunky or jerky downshifts - usually most present during the 4-3, 3-2 or 2-1 downshift in Normal trans mode and can be more harsh when in Sport trans mode.Ģ) Harsh, clunky or jerky upshifts - usually most present during the 3-4, 5-6 upshift in Normal trans mode and can be more harsh when in Sport trans mode.ģ) Stuttering of shift points when coming to a stop or accelerating.
Hopefully it will also help others possibly get resolution who may have inexperienced Service Centers.Īttached PDFs users will find the information pertaining to the 10R80 dipstick variations and trans fluid documents. It will also serve as a repository for those who have had issues with their 10R80, were able to get resolution and so those owners can post what they or their Service Center did for resolution. It contains Facts and links to other important 10R80 posts on this site. This will be the “official” 10R80 thread.
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